發送短信 : Design of a battery-operated portable DC power supply. Part 1 : voltage output control

  ______    ______    ______    ______   _____    
 /_   _//  /_   _//  /_____//  /_   _// |  __ \\  
   | ||     -| ||-   `____ `    -| ||-  | |  \ || 
  _| ||     _| ||_   /___//     _| ||_  | |__/ || 
 /__//     /_____//  `__ `     /_____// |_____//  
 `--`      `-----`   /_//      `-----`   -----`   
                     `-`